Incandescent lamp



March 30, 1937. L. GROSSMAN ET AL INCANDESCENT LAMP Filed Feb. 23, 1934 win @mrmm/v Patented Mar. 30, 1937 PATENT OFFICE INCANDESCENT Leonard Grossman, Irvington, and Gustav Hera berg, Newark, N. J. I

Application February 23, 1934, Serial No. 712,474

BCLalms.

This invention relates to the art of making incandescent electric lamps and has for an object the production of a lamp adapted to be used in standard lighting systems and enabling such systems to be much better adapted for varying lighting requirements than they are at present. The new lamp itself is designed to give varying illumination intensity without the consumption of greater current than is required to produce the particular illumination required at any given time. Regulation of the intensity of light given by such lamp is provided by the novel switch control of the present invention, and this control is satisfactorily provided in the lamp itself. The present invention thus enables different levels of lighting to be had with little or no change in the construction of standard lighting circuits. By different levels" of lighting we mean different stages of illumination. For instance, an establishment may require more light, from a givensource or sources of light, during certain parts of the working day than during certain other parts and will desire their illumination to vary in accordance with these requirements so that appropriate stages or' "levels of illumination may be maintained.

Illustrative embodiments of the invention are depicted in the accompanying drawing in which Fig. 1 is an elevation partly in section. of a lamp in which the control of the varying degrees of illumination is provided in the base of the lamp itself; Fig. 2 is a cross section taken along the line 2-2 of Fig. 1 and showing in diagrammatic form the various electrical connections with the contacts of the control and the filaments of the lamp.

The lamp of the present invention may be constructed with the usual center and side contacts by providing for the control of the circuits of the lamp within the base of the lamp itself. As indicated in the drawing, an envelope 12 of a gas-filled or vacuum type duplex lamp is housed in a Mogul base 10 provided with a standard type screw-plug H Filaments C and D (shown diagrammatically for purposes of simple explanation) have a common connection 99 leading to the shell ll of the base-plug and connected thereto at 68. The ends I02 and I03 of filaments D and C respectively are brought through the ordinary type of stem and press and are connected to the contacts 86, 81 and 8B, of the switch mechanism designated generally at 69. Movement of the contact disc 15 of the switch, as will hereinafter be more particularly described, controls the passage of current through these contacts to the filaments C and D and enables varying illumination to be obtained.

As will hereinafter appear, the lamp exemplary embodiment shows how three levels of illumination may be obtained. It should be understood'that while the control of these levels is depicted specifically the means and method of control may be modified so that various levels of illumination may be provided with a socket control and a two level illumination provided.

Coming now to the details of construction, the lamp of Fig. 1 is provided with a control switch which control may be mounted upon two parallel supporting discs 13 and ll of insulating material, preferably of fibrous insulating material, possessing some degree of give or flexibility. Inwardly extending notches or rings are provided on the inner surface of the shell 10 of a Mogul type base and corresponding depressions are formed in the discs 13 and 14 so that the discs may be pressed and snapped into place as indicated in Fig. 1.

Between the discs is provided a spindle ll having a noncircular head 16 seated in the top disc 13, and journalled on this spindle is an actuating disc 8| having a suitably shaped periphery 82 adapted to guide a chain and hold the end thereof, and allow it to be pulled through the chain guide 83 in order to turn disc 8| and actuate the switch which is designated generally at 69. A spring 18 may be provided between disc 8i and the head 16 of the spindle, the ends of the spring being hooked over projections 80 and 19 respectively in order that the spring may be put under torsion when the disc 8| is turned by means of the chain.

Disposed about the shaft 11 and below the actuating. discvfli is a contact disc 15 adapted to be moved into four successive positions in order to make or break the various circuits required to control the energization ofthe filaments C and D. This contact disc is provided with lugs 93* against which the ends of leaf spring members 93, attached to actuating disc iii, are adapted to push when the disc Si is rotated in one direction against the torsion of spring 18. The movement in this direction is, of course, caused by a pull on the pull chain which, as previously described, winds around the guideway 82 and is secured to the actuating disc 8| at a suitable point. When the force of the spring 18 pulls the actuating disc and the chain back, the leaf spring members 93 rideover the lugs 93, thus allowing the actuating disc to return to its original position preparatory to another actuation by the chain.

Beneath the contact disc 15 is provided a boss 14 which is formed with the base H. On the upper surface of this boss 14* are provided four depressions 84 spaced at 90 intervals, and fitting into these depressions are corresponding knobs 84 provided on the contact disc 15. A spring 12- may be provided between discs 8| and 15 in order to cause the knobs to seat in the depressions 94 when the disc 15 is in the proper quadrant. It will be seen that when the ends of the leaf spring members 83 have acted upon the lugs 93 to turn the disc I5 throughout a 90 angle, the knobs 84 will seat themselves in the corresponding depressions 94, thus securing the contact disc 15 against further movement. The actuating disc 8| then returns to its original position by virtue of the torsional force exerted by spring 18, the leaf spring members 88 riding over lugs 93 as previously described.-

Disc 14 is provided with a contact ring 85 diametrically opposite points of which are connected together by a metal strap 84 adapted to press against the end of the spindle I1 and make an electrical contact therewith. Near the periphery of disc 14 are provided three contacts 85, 81 and 88 spaced apart at 90 angles. Contact 88 is connected with lead I04 which is brought through the stem and press of the lamp and connected to one end of the filament C. Contact 81 is connected to lead wire I05 which also passes through the stem and press of the lamp and connects to the end of the other filament D. Contact 88 is connected to both lead wires I04 and I05. The other ends of the filaments C and D are connected to a common lead 88 which is brought through an appropriate conduit and connected to the outer shell II of the base as indicated at 68. The base contact 88 is brought through the interior of the base through conductor 81 and connected as at 85 to the spindle 15.

The contact discis provided with a pair of contacts and SI disposed along a radius extending through one of the knobs 84 of the contact disc 15. These contacts 80 and 8I are connected together by a conductor 95. When the contact disc is in the position indicated in the drawing, the contacts 80 and 8| and conductor 85 bridge the space between the fixed contact 88 and ring 85, causing an electric current to pass therethrough and providing for the energization of filament C through the circuit 88, 81, 86, 18, TI, 84, 85, 8|, 85, 80, 85, I04, I08, C, I00, 88, 58 and II.

When the chain is pulled to move the actuating disc 8| through a 90 angle, the contact disc 15 is turned 90 and conductor. 85 is placed across the circuit including ring 85 and fixed contact 81 (see Fig. 2). This allows current to pass through conductor I05 and causes filament D to be energized by way of a circuit following generally the outline of that previously described, except for its variation through contact 81 and lead I05 instead of contact 88 and lead I04.

When. the contact disc is moved through a further 90 angle, contact is made between ring 85 and contact 88, the latter being connected through leads I04 and I05 to both filaments C and D, thus causing them both to be energized.

When the lastquadrant of the cycle of the contact disc is completed, the conductor 85 is positioned so that it spans the gap between ring 85 and a fourth contact 88 and as the latter is not connected into the system, it is apparent that this is the 011" position of the switch.

What we claim-is:

1. In an incandescent electric lamp, in combination, an envelope, a base having a base'contact, a plurality of filaments mounted within the envelope and having one end of each connected to the shell of the base and having the other end of each separately connected to independent contacts and together connected to another contact, all of which filament contacts are within the base of the lamp, a switch disposed within the said base but operable from without said base, said switch having one pole connected with the base contact of the lamp and having its other pole movable over the said other contacts in order to enable the filaments to be energized separately and together by completing selected circuits from said base contact to said shell.

2. In an incandescent electric lamp, in combination, an envelope, a base, having a base contact, a plurality of filaments mounted within the envelope and having one end of each connected to the shell of the base and having the other end of each separately connected to independent contacts and together connected to another contact, all of which filament contacts are within the base of the lamp, a switch disposed within the said base but operable from without said base, said switch having one pole connected with the base contact of the lamp and having its other pole movable over the said other contacts.

3. In an incandescent electric lamp, in combiits other pole movable over the said equidistantly spaced contacts, means for rotating said switch throughout an angle sufficient, to open one circuit and close another circuit, and means for automatically returning said switch-operating means to a switch-operating position.

4. In an incandescent electric lamp, in combination, an envelope, a base, having a base contact, a plurality of filaments mounted within the envelope and having one end of each connected to the shell of the base and having the other end of each separately connected to independent contacts and together connected to another contact, all of which filament contacts are within the base of the lamp and disposed equidistantly from a center point, a switch disposed within the said base, said switch being rotatable about said center point and having one pole connected with the base contact of the lamp and having its other pole movable over the said equidistantly spaced contacts, and means for rotating said switch to close each of the filament circuits by separately connecting said contacts with the base contact of the lamp.

5. In an incandescent electric lamp, in combination, a base, a contact ring and a plurality of contacts disposed within said base, a plurality of filaments mounted within said lamp having one end of each connected separately to certain of said contacts and together to another of said contacts, and a switch device within said base adapted and arranged to connect'selected contacts with said ring whereby the filaments may be energized separately or together by completing selected circuits within the lamp.

6. In an incandescent electric lamp, in combination, a base having a shell contact and a base contact and having disposed within it a contact ring connected to said base contact, and a plurality of switch contacts disposed around the periphery of the ring but separated therefrom, a plurality of filaments mounted within said lamp and having one end of each connected to said shell contact and having the other end of each separately connected to certain of said switch contacts and together connected to another of said contacts, and a switch device adapted and arranged to connect selected switch contacts with 5 said ring.

I LEONARD GROSSMAN.

GUSTAV HERZBERG. 

